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Update to Windows 10 from Windows 8.1 failed multiple times

I have huge issues updating from Windows 8.1 Pro (that is upgraded form Windows 7 Ultimate itself) to Windows 10.

First of all some information:

I’ve Polish version of Windows 8.1 Pro

I’m a poweruser

I’m using Asus G75VW laptop

I’ve done multiple attempts to update Windows in last couple of days but virtually nothing works for me. I tried upgrading through Windows Update, Windows Media Creation Tool and using USB stick with Windows 10 on it. Nothing works. I’m deleting $Windows.~BT,
$Windows.~WS, Windows\SoftwareDistribution\Download before every attempt. I put my Windows into “clean boot” as described here
https://support.microsoft.com/en-us/kb/929135. I tried to set my Windows in US-EN locale/region. Nothing works.

One thing in common in every attempt is that upgrade is failing during the restart – two screens appear for fraction of a second each and computer is restarting again and I’m back to Windows 8.1 as if nothing ever happened. I recorded this with my
phone (Polish Windows – sorry):

When using Media Creation Tool update or USB stick update everything seems to be working fine until I’m getting “Modern Setup Host has stopped working” error during “Computer will be restarted soon” screen. Then the only option is to restart Windows
manually and I’m getting restart problem shown above. I found setuperr.log with this:

Disconnect all the unnecessary external devices connected to the computer (except the mouse and the keyboard)

Please disconnect all the unnecessary external devices connected to the computer (except the mouse and the keyboard) and then check if you still face this issue while installing Windows 10.

Also, make sure that you install all the pending updates (including the optional updates) for your Windows Operating System via Windows Update and check if the issue persists.

Method 2:

Disable security software
Disclaimer: Antivirus software can help protect your computer against viruses and other security threats. In most cases, you shouldn't disable your antivirus software. If you have to temporarily disable it to install other software, you should re-enable it
as soon as you're done. If you're connected to the Internet or a network while your antivirus

We are currently sharing the same problem, you, me and another French user.
Actually looked at the logs a lot of times and tried to update at least 15 times now, exactly same errors and "flash reboot" as you.

I'll let you know if I find something interesting.
Actually we seem to be quite alone on this problem..

I didn’t tried it. But today, out of desperation, I did clean Windows 8.1 install using USB drive made with Windows 8.1 Media Creation Tool and Windows 10 upgrade immediately after that (actually Windows 8.1 installer suggest Windows 10 upgrade at
the last step of installation). And it finally worked :)

I’m still not sure why upgrade didn’t work on the first place. Maybe the problem was that on Windows 8.1 I had users folders “robocopied” to other drive :) and this trick is not working on Windows 10 at all from what I can see right now. Or maybe it
was Nvidia drivers :)

I hope that this helps and you will be able to update your Windows successfully.

It seems weird because I found some reports of users for which the upgrade completed successfully even with Users folder on another drive, also when I check the XML files for UserMig it shows that it seems to have no problem with data on another disk.

Well, well, I'll try to install Windows 8.1 and migrate to Windows 10 with the MCT.